gcc/testsuite/gcc.dg/pr55940.c

   1 /* PR target/55940 */
   2 /* { dg-do run } */
   3 /* { dg-options "-Os" } */
   4 /* { dg-additional-options "-mpreferred-stack-boundary=2" { target { { i?86-*-* x86_64-*-* } && ia32 } } } */
   5
   6 struct S { int s; unsigned long t; };
   7
   8 __attribute__ ((noinline, noclone)) unsigned long long
   9 bar (struct S *x, unsigned long y)
  10 {
  11   asm volatile ("" : : "r" (x), "r" (y) : "memory");
  12   return x->s + y;
  13 }
  14
  15 __attribute__ ((noinline, noclone)) unsigned long long
  16 foo (struct S *x, unsigned long y)
  17 {
  18   unsigned long a;
  19   if (__builtin_expect (((__UINTPTR_TYPE__) (x) + 0x1000U < 0x2000U), 0))
  20     return ~0ULL;
  21   if (__builtin_expect (x->s <= 0 || x->s > 9, 0))
  22     return ~0ULL;
  23   a = x->t >> 12;
  24   if (y == a)
  25     return ~0ULL;
  26   if (x->s == 3)
  27     return x->t + y * 4096;
  28   return bar (x, y);
  29 }
  30
  31 int va, vb, vc, vd;
  32
  33 int
  34 main ()
  35 {
  36   struct S s;
  37   asm volatile ("" : : : "memory");
  38   int a = va, b = vb, c = vc, d = vd;
  39   asm volatile ("" : : : "memory");
  40   int i;
  41   for (i = 0; i < 64; i++)
  42     if (foo ((struct S *) 0, 0) != ~0ULL)
  43       __builtin_abort ();
  44   s.s = 3;
  45   s.t = 2 << 12;
  46   if (foo (&s, 2) != ~0ULL)
  47     __builtin_abort ();
  48   if (foo (&s, 3) != (2 << 12) + 3 * 4096)
  49     __builtin_abort ();
  50   asm volatile ("" : : : "memory");
  51   va = a; vb = b; vc = c; vd = d;
  52   asm volatile ("" : : : "memory");
  53   return 0;
  54 }